So Microsoft has this cool little feature where publishers an opt to take their disc titles and have players download them instead. This leads to really cool little bonuses, such as not having to go get the game disc for a game that is already installed to my HDD. And it also solves the problem of trying to find a copy of an out of print title.
Seriously SE, put the Ultimate Collection up as a Game on Demand. Utilize the tools that the console makers give you.